“Kendall is Kylie’s best friend for life and wants nothing but the best for her. She likes Tyga and is glad her sister is so in love and happy. But she is concerned at times at how far Kylie has fallen under his spell. Kylie dresses the way he likes and does whatever he wants. When he’s around, she is on him like glue. The obsessive relationship they have has created a bit of distance between Kendall and Kylie at times, which never happened before,” a source tells HollywoodLife.com EXCLUSIVELY.

“Kendall is the older sister, so she can’t help but worry about Kylie. She knows Kylie is being careful and says she has no plans on getting pregnant, but she still worries she will make a mistake and end up with an unplanned pregnancy. Kendall teases her, saying she better not end up with an ‘oops baby,'” our source adds.

Let’s just hope that joke doesn’t become a reality. HollywoodLifers, do you think Kendall should be worried?